With few options, Clinton goes after undecided, Obama superdelegates

The final primaries are tomorrow in South Dakota and Montana. After that, party leaders have said it will be time for Democrats to unite behind one candidate before the convention.

Clinton's strategy heading into the week appears aimed at winning over not only the undecided superdelegates, but also to peel away some of those who have endorsed Obama. Last night,Clinton told reporters that superdelegates "can change their minds."

Clinton campaign chairman Terry McAuliffe says it's "an uphill climb," but after a strong victory in Puerto Rico over the weekend, he doesn't plan to give up. Appearing on CBS' "Early Show," McAuliffe says the Clinton team still believes she will win the nomination, because she can win the swing states from McCain in November's general election.